Mitsubishi Electric PFFY-P20VKM-E2 Technical & Service Manual Download Page 31

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OPERATING PROCEDURE

PHOTOS

Photo 14

Photo 13

Heat exchanger

Screws of the

heat exchanger

8. Removing the pipe temperature detection (liquid and

gas) thermistors and room temperature thermistor

(1) Remove the panel. (Refer to procedure 1)

(2) Remove the screw of the electrical cover, and then the

electrical cover. (See Photo 3)

(3) Remove the pipe temperature detection (liquid and gas)

thermistors from the holders.

(4) Disconnect the connector CN44 on the indoor controller

board.

(5) Loosen the room temperature thermistor wire clamp under

the electrical box.

(6) Disconnect the connector CN20 on the indoor controller

board.

9. Removing the heat exchanger and linear expansion

valve

(1) Remove the panel. (Refer to procedure 1)

(2) Remove the hair pin cover and water cover (See Photo 3)

(3) Remove the 2 screws of the heat exchanger. (See Photo

14)

(4) Unhook the heat exchanger from 2 catches (electrical box

side).

(5) Pull out the heat exchanger and linear expansion valve.

Photo 12

Thermistor

(Gas/TH23)

Thermistor

(Liquid/TH22)

Room temperature

thermistor (TH21)

Hair pin cover

OCH537

Summary of Contents for PFFY-P20VKM-E2

Page 1: ...ERIA CURVES 14 5 AIR OUTLET SELECTION 15 6 OUTLINES AND DIMENSIONS 16 7 WIRING DIAGRAM 17 8 REFRIGERANT SYSTEM DIAGRAM 18 9 TROUBLE SHOOTING 19 10 DISASSEMBLY PROCEDURE 27 SPLIT TYPE HEAT PUMP AIR CONDITIONERS R410A December 2012 Model name indication Note This service manual describes technical data of the indoor units As for outdoor units refer to outdoor unit s service manual PFFY P20VKM E2 PFF...

Page 2: ...ter into refrigerant cycle that can cause deterioration of refrigerant oil or malfunction of com pressor If large amount of mineral oil enter that can cause deterio ration of refrigerant oil etc Do not use the existing refrigerant piping The old refrigerant and lubricant in the existing piping contains a large amount of chlorine which may cause the lubricant deterioration of the new unit Use low r...

Page 3: ... cylinder Check that cylinder for R410A on the market is syphon type Charging should be performed with the cylinder of syphon stood vertically Refrigerant is charged from liquid phase No Tool name Specifications 1 Gauge manifold Only for R410A Use the existing fitting specifications UNF1 2 Use high tension side pressure of 5 3MPa G or over 2 Charge hose Only for R410A Use pressure performance of 5...

Page 4: ...4 PART NAMES AND FUNCTIONS 2 2 1 Indoor Unit Louver Louver Air outlet Vane Filter Vane Air outlet Air inlet OCH537 ...

Page 5: ...n error ON OFF lamp Main display Press to change the operation mode Main menu Press to move the cursor down Function button F1 Main display Press to decrease temperature Main menu Press to move the cursor up Function button F2 Main display Press to increase temperature Main menu Press to go to the previous page Function button F3 Main display Press to change the fan speed Main menu Press to go to ...

Page 6: ... ON OFF operation is centrally controlled Appears when the operation mode is centrally controlled Appears when the preset temperature is centrally controlled Appears when the f lter reset function is centrally controlled Indicates when f lter needs maintenance Current room temperature appears here Room temperature See the Installation Manual Appears when the buttons are locked Appears when the On ...

Page 7: ...ver Vent Lossnay High power Weekly timer Restriction Maintenance Initial setting On Off timer Auto Off timer Temp range Operation lock Manual vane angle Main Sub Timer Main display Contrast Display details Auto mode Administrator password Language selection Service Service menu Input maintenance info Function setting Lossnay City Multi only Check Self check Maintenance password Remote controller c...

Page 8: ...operate at the preset temperature after performing energy save operation for a specif ed time period Time can be set to a value from 30 and 120 in 10 minute increments This function will not be valid when the preset temperature ranges are restricted Schedule Set the start stop times to operate the units in the energy save mode for each day of the week and set the energy saving rate Up to four ener...

Page 9: ...ance Select Input maintenance Info from the Service menu to bring up the Maintenance information screen The following settings can be made from the Maintenance Information screen Model name input Serial No input Dealer information input Function setting Make the settings for the indoor unit functions via the remote controller as necessary LOSSNAY setting City Multi only This setting is required on...

Page 10: ...erature display range is 8 39 The display blinks if the temperature is less than 8 or 39 or more Louver display Indicates the action of the swing louver Does not appear if the louver is not running Power On indicator Indicates that the power is on Fan Speed indicator Shows the selected fan speed Ventilation indicator Appears when the unit is running in Ventilation mode Operation Section Temperatur...

Page 11: ... connected When power is turned ON for the first time it is normal that PLEASE WAIT is displayed on the room temperature indication For max 2 minutes Please wait until this PLEASE WAIT indication disappear then start the operation For the PFFY P VKM series the airflow direction displayed on the remote controller is different from the actual airflow direc tion Refer to the following table Display A...

Page 12: ...ube Type Line flow fan 2 Airflow rate 2 m3 min 5 9 6 8 7 6 8 7 6 1 7 0 8 0 9 1 6 1 7 0 8 0 9 1 8 0 9 0 9 5 10 7 Fan External static Pa 0 pressure Motor Type DC motor Output kW 0 03 2 Air filter PP honeycomb fabric Catechin air filter Refrigerant Gas Flare mm 12 7 pipe dimension Liquid Flare mm 6 35 Field drain pipe size mm I D 16 PVC pipe VP 16 connectable Noise level 2 dB A 27 31 34 37 28 32 35 3...

Page 13: ...inear expansion valve coil PFFY P20VKM E2 Fuse Indoor controller board Fan motor Upper Fan motor Lower Power supply terminal block Transmission terminal block OUTPUT 30W ARW40Z8P30MS MP20Z DC12V MP35EA DC12V DC12V Stepping motor drive Port dimension 5 2 0 2000 pulse EFM 40YGME OUTPUT 30W ARW40Y8P30MS Thermistor Room temperature detection Thermistor Pipe temperature detection Liquid Thermistor Pipe...

Page 14: ...RO BAR BAND CENTER FREQUENCIES Hz Test conditions Cooling Dry bulb temperature 27 Wet bulb temperature 19 APPROXIMATE THRESHOLD OF HEARING FOR CONTINUOUS NOISE COOLING FUNCTION 37 37 SPL dB A LINE High FAN SPEED HEATING Heating Dry bulb temperature 20 Wet bulb temperature 15 90 80 70 60 50 40 30 20 10 63 125 250 500 1000 2000 4000 8000 NC 60 NC 50 NC 40 NC 30 NC 20 NC 70 OCTAVE BAND SOUND PRESSURE...

Page 15: ...temperature and set temperature are dif ferent 1 Upper air flow Room temperature is close to set temperature or thermo off 1 Upper air flow only Upper and lower air flow Normal condition in heating Upper air flow During defrosting op eration start of opera tion thermo off Upper and lower air flow COOL DRY HEAT FAN Air flow Conditions Be sure to keep the area around the vane of the lower air outlet...

Page 16: ... 131 4 6 Hole Indoor unit Installation plate 96 123 125 60 19 12 60 128 118 165 205 200 12 12 11 Gas pipe 12 7 flared 1 2 Liquid pipe 6 35 flared 1 4 drain Air in Air out Air out 46 5 46 5 600 700 54 5 508 137 5 607 More than 100mm More than 100mm More than 100mm PFFY P20VKM E2 PFFY P25VKM E2 PFFY P32VKM E2 PFFY P40VKM E2 OCH537 ...

Page 17: ...IGIT ADDRESS SETTING 10ths DIGIT BRANCH NO OPTION SELECTOR NAME SW1 SW11 SW12 SW14 SWC LED on indoor board for service MEANING MARK Main power supply Power supply for MA Remote controller Main power supply Indoor unit 220 240V power on Iamp is Iit Power supply for MA remote controller on Iamp is lit FUNCTION LED1 LED2 TERMINAL BLOCK THERMISTOR ADDRESS BOARD PIPE TEMP DETECTION GAS 0 C 15kΩ 25 C 5 ...

Page 18: ...erature detection TH21 Thermistor Pipe temperature detection Gas TH23 Thermistor Pipe temperature detection Liquid TH22 Linear expansion valve Gas pipe Liquid pipe Flare connection Gas pipe Liquid pipe PFFY P20 P25 P32 P40VKM E2 12 7 1 2 6 35 1 4 Item Capacity Unit mm PFFY P20VKM E2 PFFY P25VKM E2 PFFY P32VKM E2 PFFY P40VKM E2 OCH537 ...

Page 19: ... Normal 200 10 1 5 White Red 2 6 Yellow Brown 3 5 Orange Red 4 6 Blue Brown Orange Red White Blue Brown Yellow M Refer to 9 2 Fan motor MF1 2 Measure the resistance between the terminals with a tester Surrounding temperature 20 30 Vane motor MV2 Normal Connector Abnormal 186 214 Open or short Brown Yellow Brown Blue Red Orange Red Pink Refer to the next page for a detail Blue Yellow Brown Orange R...

Page 20: ...mperature thermistor TH22 Gas pipe temperature thermistor TH23 Thermistor R0 15k 3 Fixed number of B 3480 2 Rt 15exp 3480 0 15k 10 9 6k 20 6 3k 25 5 2k 30 4 3k 40 3 0k Thermistor for lower temperature Linear expansion valve 1 Operation summary of the linear expansion valve Linear expansion valve open close through stepping motor after receiving the pulse signal from the indoor controller board Val...

Page 21: ...ve is not closed all the way It is not necessary to exchange the linear expansion valve if the leakage is small and not making any trouble Liquid pipe thermistor Linear expansion valve Motor will idle and make ticking noise when motor is operated while the linear expansion valve is locked This ticking sound is the sign of the abnormality Check the color of lead wire and missing terminal of the con...

Page 22: ...motor operation In the case that the fan motor off the voltage is 0V Check method of indoor fan motor fan motor control P C board Wiring recovery Was contact caused good Yes NG Replace the indoor controller board Replace the fan motor Is the voltage normal Yes No Check the operation END OK Does the voltage repeat DC 0V and DC 15V No Yes Fan motor position sensor signal check Turn around the fan mo...

Page 23: ...5 Heat 4degrees up Superheat setting temperature 6 Sub cool setting temperature 6 Heat pump Effective Not available Not available First setting Down B C Not effective Effective 1 2 3 4 5 6 7 8 9 10 1 2 3 4 5 6 7 8 9 10 SW2 Capacity code setting 1 6 1 5 SW3 Function setting Thermistor Room temperature detection position Initial setting ON OFF 1 2 3 4 5 6 7 8 9 10 Indoor controller board Note 4 Refe...

Page 24: ...dress can be set while the unit is stopped Address board Initial setting Address board SW12 10 SW11 1 SW12 SW11 SW14 SW14 Initial setting Effective timing Before power supply ON How to set address Example If address is 3 remain SW12 for over 10 at 0 and match SW11 for 1 to 9 with 3 How to set branch number SW14 Series R2 only Match the indoor unit s refrigerant pipe with the BC contoller s end con...

Page 25: ...or 1 2 Status lamp 12VDC 1 Fan motor output SW1 5 OFF Thermostat ON SW1 5 ON 1 3 Cooling Dry status lamp 12VDC 1 1 4 Heating status lamp 12VDC 1 The voltage range of DC12V above is between DC11 5 V to DC 13 7 V FUSE 6 3A 250V CND Power supply 1 3 220 240V AC CNMF1 CNMF2 FAN motor upper CNMF11 CNMF21 DC310V 340V CNMF23 1 15V DC CNMF25 1 0 6 5V DC CNMF27 1 0 15V DC FAN motor lower CNMF12 CNMF22 DC31...

Page 26: ...26 9 4 2 Address board PFFY P20VKM E2 PFFY P25VKM E2 PFFY P32VKM E2 PFFY P40VKM E2 SW1 Function setting SW12 10ths digit address setting SW11 1s digit address setting SWC Air outlet selection OCH537 ...

Page 27: ... front grille from the panel See Photo 1 2 Remove the screws of the panel See Photo 2 3 Open the horizontal vane and push the left right and middle of the upper part of the panel and pull the panel toward you See Photo 2 4 Lift up the panel and remove it from the box Push Push Grille PFFY P20VKM E2 PFFY P25VKM E2 PFFY P32VKM E2 PFFY P40VKM E2 Screws of the panel Push Horizontal vane Push Push OCH5...

Page 28: ...rd 8 Pull out the indoor controller board case from the electri cal box Terminal block TB2 Screw of the ground wire I B Photo 4 3 Removing the electrical box 1 Remove the panel Refer to procedure 1 2 Remove the electrical cover Refer to procedure 2 3 Remove the ground wires from the electrical box Refer to pro cedure 2 4 Remove the ground wires connected to the indoor fan motor and ones connected ...

Page 29: ...indoor fan motor upper 1 Remove the panel Refer to procedure 1 2 Remove the electrical box Refer to procedure 3 3 Remove the nozzle upper See Photo 6 4 Unhook the water cover from the catches and remove the water cover See Photo 6 5 Removing the screw of the motor band and then the motor band See Photo 7 6 Remove the line flow fan and the indoor fan motor upper from the box Photo 7 Screw of motor ...

Page 30: ...y lower See Photo 9 5 Remove the screws of the vane motor support and then the vane motor support 6 Remove the screws of the vane motor and then the vane motor from the vane motor support 7 Disconnect the connector from the vane motor 8 Remove the limit switch vane under LS 7 Removing the indoor fan motor 1 Remove the panel Refer to procedure 1 2 Remove the nozzle assembly lower and the drain hose...

Page 31: ...onnector CN44 on the indoor controller board 5 Loosen the room temperature thermistor wire clamp under the electrical box 6 Disconnect the connector CN20 on the indoor controller board 9 Removing the heat exchanger and linear expansion valve 1 Remove the panel Refer to procedure 1 2 Remove the hair pin cover and water cover See Photo 3 3 Remove the 2 screws of the heat exchanger See Photo 14 4 Unh...

Page 32: ... MARUNOUCHI CHIYODA KU TOKYO 100 8310 JAPAN C Copyright 2012 MITSUBISHI ELECTRIC CORPORATION Distributed in Dec 2012 No OCH537 Made in Japan New publication effective Dec 2012 Specifications are subject to change without notice TM ...

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